And rexford m



eqww.

F. J. HOAG AND H. M. SMITH.

MANIFOLD HEATER FOR INTERNAL COMBUSTION ENGINES.

APPLICATION FILED NOV. 25. I916.

1,803,559. Patented May 13, 1919.

2 SHEETS-SHEET L.

R1. HOAG AND R. M. SMITH. MANIFOLD HEATER FOR INTERNAL COMBUSTION ENGINES. APPLICATION man NOV. 25. 1915i 1,303,559, Patented May 13, 1919.

2 sHEETs-sritm 2.

Myw

fatten L21 UNITED STATES PATENT OFFICE.

FRANK J. HOAG, OF CORTLAND, NEW YORK, AND REXFORD M. SMITH, OF'WASHING TON, DISTRICT OF COLUMBIA; SAID SMITH ASSIGNOR TO SAID HOAG.

MANIFOLD-HEATER FOR INTERNAL-COMBUSTION ENGINES.

i,so3,559.

Specification of Letters Patent.

Patented May 13, 1919.

Application filed November 25, 1916. 1 Serial No. 183,446.

State of New York, and lVashington, in the.

District of Columbia, have invented new and useful Improvements in Manifold-Heaters for Internal-Combustion Engines, of which the following is a specification.

This invention relates to manifold heaters,

the-object in view being to produce a heater for the intake manifold of internal combus' tion engines, whereby, in cold weather, the intake manifold may be maintained at a uniform temperature while the engine is in operation.

One of the principal objects ofthi-s invention is to provide an intake manifold heater which is so disposed in relation to the intake manifold as to form a jacket which incloses a major portion of the intake manifold and is in direct communication with the exhaust manifold or pipe of the engine, and also in communication with the atmosphere, where-- by exhaust or burned gases in a highly heated condition may be conducted into the heater and exhausted therefrom, the said highly heated exhaust impinging directly against and passing over and around and in contact with all sides of the inclosed portion of the intake manifold.

A'further object is to provide means in connection with the outlet from the heater,

by Which the flow of highly heated exhaust gases through the jacket of the heater may be regulated in accordance with theatmospheric temperature, thereby adapting the heater to all seasons of the year.

A further object of the invention is to 4 provide a special way of conducting the highly heated exhaust gases to the jacket of the intake heater and venting the same therefrom, so as to cause a thorough circulation of the hot gases around the portions of the intake manifold inclosed by the heater.

Another object of the invention is to provide in conjunction with the jacket of the heater, means enablin hot water to be in troduced therein so as to fill the heater and remain in contact with the intake manifold; also means for draining ofl the water after the intake manifold has been sufliciently heated. The last named feature is particularly useful in starting an internal combustion engine in extremely cold weather and does away with the necessity of priming the cyllnders of the engine with gasolene or other priming agent. It only requires a few minutes after pouring hot water into the heater to sufficiently heat the intake pipe of the engine to enable the engine to be started, as the intake manifold will then sufliciently heat the gasolene or other fuel to make the same combustible and ready for ignition in the combustion chambers of the cylinders of the engine.

Another object of the invention is to provlde in connection with the heater jacket, a detachable cover plate for giving access to the interior of the heater for the purpose of removing carbon and other accumulations therefrom, together with means for securing said cover in fixed relation to the main body of the heater jacket, the said cover retaining means embodying a tubular bolt which is adapted by reason of its tubular formation to form a support or point of attachment for an auxiliary air inlet valve, said bolt forming a conduit which is connected directly to the intake manifold so as to admit air thereto, and which also has a portion contained within and inclosed by the heater jacket for the purpose of heating the auxiliary air on its way to the intake manifold.

With the above and other objects in view, the invention consists in the novel construction, combination and arrangement of parts, herein described, illustrated and claimed.

In the accompanying drawin s:-

Figure 1 is a side elevation 0 an internal combustion engine, illustrating the heater jacket in its applied relation to the intake manifold and exhaust manifold of the enne. Fig; 2 is a vertical transverse section through the same on the line 2-2 of Fig. 1, on an enlarged scale.

Fig. 3 is a fragmentary inclined longitudinal section on the line 3-3 of Fig. 2.

Fig. 4 is a fragmentary vertical transverse section taken in line with the hot Water inlet of the heater jacket.

Fig. 5 is a fragmentary section showing one of the thim-bles connecting one of the flexible pipes with the exhaust manifold.

Fig, 6 is a face'view of a slightly modified form of heater jacket, said view being partly broken away in section to illustrate the process of casting the heater jacket around the intake manifold.

Fig. 7 is a section on the line 7-7 of Fig.

6, showing an attached auxiliary air inlet the flange 2 to which the carbureterD is secured, and also embodying the oppositely extending branches 5 and 6 which are fastened to the engine at the points 7 and 8.

\Vhile the branches 5 and 6 are round in cross section, the portion or leg 3 of the intake manifold is elliptical in cross section due to the widening of the portion 3 where it merges into and communicates with the branches 5 and 6 as shown in Fig. 3.

The heater comprises a jacket designated v generally at E and this jacket, one embodiment of the invention, is spht, divided,

'or made in two separately formed sections 9 and 10 as indicated in Figs. '2, 3 and 4,

'said sections being provided along their meeting edges with flanges 11 and 12 which arese'cured together by fastening means 13 shown in the form of screws or bolts, .packmg or gasket strips 14 interposed between the meeting faces of the flanges as shown so as to form a liquid tight joint.-

Other packing strips 15 are interposed between the sections 9 and 10 and the portions" 3, 5 and 6 of the intake manifold, for the same purpose. g

The formation ofthe sections 9 and 10, 18

such as to allow for the circulation of hot gases entirely around the portions 3, 5 and 6 of the intake manifold B within the heating jacket E. In order to secure a firm and fixed relation between the jacket and the intake pipe, the sections 9 and 10 of the jacket are inwardly off-set at the points 16 and 17, such off-set portions bearing or resting directly against the portions 5 and 6 of the intake manifold as clearly shown in Figs.

3 and 4. This leaves a heating space or cavity surrounding the branches 5 and 6 of the manifold adjacent to the opposite ends of the jacket, and also over the upper portion of the intake manifold, as clearly indicated in Fig. 3. At opposite sides of the portion 3 of the manifold and beneath the branches 5 and 6 thereof, the shape of the heater provides an extension heating chamber 22 and the lower portion of the jacket is offset as shown at 23 a sufficient distance from the adjacent wall of the portion 3 of the intake manifold to allow for the formation in the bottom of the jacket of the outlet orifice 24.

In the modification shown in Figs. 6 and 7, the front portion 10 of the heating jacket is formed with a large opening 25 therein which is ordinarily closed by means of a cover plate 216 shaped to conform to the opening which itself conforms in the main to the general shape of the heating jacket as indicated in Fig. 6. The means for fastening the cover plate 26 in place, is shown in Fig.-

7 as comprising a tubular stem or bolt 27, the inner end of which is threaded and screwed into a threaded hole 28 in the intake manifold B, or front section 10 said bolt 27 extending outwardly from the manifold through a hole 29 in the cover plate 26 where it is threaded to receive a clamping nut 30. By reason of its tubular formation, the bolt ;27 is adapted to have mounted thereon an auxiliary air inlet valve F as shown in Fig. 7, the air from said valve passing through the bolt 27 into the intake manifold B, a portion of said tubular bolt bein inclosed Within the heating jacket E and being thereby subjected to the action of the hot gases as uable and useful adjunct in cold weather or after the engine has been idle in a cold garage or other building during the night time. Preferably a water cup 32 is associated with the tubular ofl-set or boss 31 and equipped with a stop cook 33 which maybe closed after the jacket has been filled with hot water. Connected with the outlet orifice 24 is a regulating cook 34 and connected thereto is an outlet pipe 35 which may lead down- Wardly through the pan under the bottom of the engine, the pipe 35 being preferably of the flexible type so that it may be inserted through any conveniently located hole in the pan or bottom frame or bed plate of the ene. The hot gases from the exhaust manifold or pipe 0 are conducted into the heater casmg E by means of flexible pipes 36, the disaway at one side as shown at 40 to more readily catch the exhaust gases as they flow in the direction of the arrow in Fi 5 toward the muflier or atmosphere after caving the combustion chambers of the engine. If desired, a set screw 41 may be employed to fasten the adjacent end of each flexible pipe 36 in a respective thimble 38 as shown in Fig. 5. j

The hot exhaust passes through the flexible pipes 36 into the heater jacket E at points adjacent to the opposite ends thereof and impinges directly against and passes around the branches 5 and 6 of the intake manifold B, then around the upright portion or leg 3 of the manifold and outwardly through the orifice 24 and pipe 35. The flow of the hot gases may be retarded to any desired extent by means of the regulating cook 34 in accordance with the season of the year and the temperature of the outside atmos: phere, it bein understood that more heat is required in t e'winter season than in the summer season. The starting of the engine in extremely cold weather is greatly facilitated by closing the regulating cock 34 and filling the heating jacket E with hot water introduced through the inlet off-set or filling nozzle 31. After the intake manifold has thus been heated sufficiently by hot water, the regulating cock 34 is opened, allowing the water to drain off through the pipe 35. The engine is then started and after that a portion of the heated gases passes through the ipes 36 into the heating jacket and outwardly through the pipe 35 the capacity of which is regulated by the cook 34.

By reason of the particular shape and construction of the heating jacket, a maximum amount of heating space is provided within the jacket, permitting the hot gases to act upon more than half of the intake manifold, including the branches thereof. The heat reaches well out along the branches of the intake manifold and this enables the lower part of the heating jacket to be comparatively short so as not to approach too closely to the carburetor, thereby preventing overheating of the carburetor and that portion of the intake manifold to which the carbureter is attached. The combined capacity of the two flexible pi es 36 is greater than the capacity of the out et pipe 35thus causing a v ings 14 and-15 are of as estos'combined with 1 soft metal such as brass or copper .or both,

thereby forming resilient cushions between the meeting faces of the sections of the heating jacket and between the heating jacket and the portions 3, 5 and 6 of the intake manifold, also providin liquid tight joints at all points where sai packings are employed. Interference with the throttle lever or rod of the carbureter is eliminated by terminatin at a su cient height above the carbureter to leave roper clearance for said throttle lever or rodi thus doing away with any diiiiculty in installing the superheating jacket, at the same time eliminating danger of overheatin the lower end of the intake manifold an the carbureter. By removing the cover plate 26 or front section 10, accumulated carbon and other foreignmatter may bequickly removed from the interior of the heater.

We claim The combination with an internal combus-- cover plate, for the purpose set forth.

- In testimony whereof we afiix our signatures.

FRANK J. HOAG. REXFORD M. SMITH.

the bottom of the heating jacket I 

